Jijin Chang, Zhihong Wu*, Xinyu Guo, Dan Niu, Anwen Ren, Jincui Ren, Jun Qi and Huafeng Zhou,
{"title":"尿素辅助绿色合成用于微波吸收的 CeO2 纳米颗粒/多孔碳复合材料","authors":"Jijin Chang, Zhihong Wu*, Xinyu Guo, Dan Niu, Anwen Ren, Jincui Ren, Jun Qi and Huafeng Zhou, ","doi":"10.1021/acsanm.4c01784","DOIUrl":null,"url":null,"abstract":"<p >The development of economical, high-efficiency synthesis approaches is the primary field of concern for research on microwave-absorbing materials (MAMs). In this work, we used the hydrothermal approach to effectively manufacture CeO<sub>2</sub> nanoparticles/porous carbon composites enriched with oxygen vacancies under urea-assisted conditions. The carbon source for these composites was the porous carbon generated from bamboo powders. We adjusted the electromagnetic characteristics of the composites to optimize their electromagnetic wave (EMW) attenuation mechanisms and impedance matching properties by altering the heat treatment temperatures and the extra quantity of cerium salts. The creation of many defects and heterostructures as a result of the nitrogen/oxygen doping and oxygen vacancy-rich CeO<sub>2</sub> leads to better EMW attenuation, conductivity loss, and increased polarization effects. The remarkable microwave absorption ability of the C2-500 composite is attributed to good impedance matching and interfacial polarization as well as dipole polarization induced by a significant number of heterogeneous interfaces and oxygen vacancies, particularly from N/O heterogeneous elements. At a filler loading of 10 wt %, C2-500 exhibits a minimum reflection loss (RL<sub>min</sub>) of −44.94 dB at 16.16 GHz, accompanied by an effective absorption bandwidth (EAB) of 4.72 GHz. In comparison, the C3-500 composites demonstrate an EAB of 4.88 GHz and an RL<sub>min</sub> of −46.81 dB at 9.28 GHz. This study is expected to be instrumental in the design of high-performance biomass-derived porous carbon-based MAMs, providing valuable insights for future research in this field.</p>","PeriodicalId":6,"journal":{"name":"ACS Applied Nano Materials","volume":null,"pages":null},"PeriodicalIF":5.3000,"publicationDate":"2024-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Urea-Assisted Green Synthesis of CeO2 Nanoparticles/Porous Carbon Composites for Microwave Absorption\",\"authors\":\"Jijin Chang, Zhihong Wu*, Xinyu Guo, Dan Niu, Anwen Ren, Jincui Ren, Jun Qi and Huafeng Zhou, \",\"doi\":\"10.1021/acsanm.4c01784\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p >The development of economical, high-efficiency synthesis approaches is the primary field of concern for research on microwave-absorbing materials (MAMs). In this work, we used the hydrothermal approach to effectively manufacture CeO<sub>2</sub> nanoparticles/porous carbon composites enriched with oxygen vacancies under urea-assisted conditions. The carbon source for these composites was the porous carbon generated from bamboo powders. We adjusted the electromagnetic characteristics of the composites to optimize their electromagnetic wave (EMW) attenuation mechanisms and impedance matching properties by altering the heat treatment temperatures and the extra quantity of cerium salts. The creation of many defects and heterostructures as a result of the nitrogen/oxygen doping and oxygen vacancy-rich CeO<sub>2</sub> leads to better EMW attenuation, conductivity loss, and increased polarization effects. The remarkable microwave absorption ability of the C2-500 composite is attributed to good impedance matching and interfacial polarization as well as dipole polarization induced by a significant number of heterogeneous interfaces and oxygen vacancies, particularly from N/O heterogeneous elements. At a filler loading of 10 wt %, C2-500 exhibits a minimum reflection loss (RL<sub>min</sub>) of −44.94 dB at 16.16 GHz, accompanied by an effective absorption bandwidth (EAB) of 4.72 GHz. In comparison, the C3-500 composites demonstrate an EAB of 4.88 GHz and an RL<sub>min</sub> of −46.81 dB at 9.28 GHz. This study is expected to be instrumental in the design of high-performance biomass-derived porous carbon-based MAMs, providing valuable insights for future research in this field.</p>\",\"PeriodicalId\":6,\"journal\":{\"name\":\"ACS Applied Nano Materials\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":5.3000,\"publicationDate\":\"2024-06-13\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"ACS Applied Nano Materials\",\"FirstCategoryId\":\"88\",\"ListUrlMain\":\"https://pubs.acs.org/doi/10.1021/acsanm.4c01784\",\"RegionNum\":2,\"RegionCategory\":\"材料科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"MATERIALS SCIENCE, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"ACS Applied Nano Materials","FirstCategoryId":"88","ListUrlMain":"https://pubs.acs.org/doi/10.1021/acsanm.4c01784","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
Urea-Assisted Green Synthesis of CeO2 Nanoparticles/Porous Carbon Composites for Microwave Absorption
The development of economical, high-efficiency synthesis approaches is the primary field of concern for research on microwave-absorbing materials (MAMs). In this work, we used the hydrothermal approach to effectively manufacture CeO2 nanoparticles/porous carbon composites enriched with oxygen vacancies under urea-assisted conditions. The carbon source for these composites was the porous carbon generated from bamboo powders. We adjusted the electromagnetic characteristics of the composites to optimize their electromagnetic wave (EMW) attenuation mechanisms and impedance matching properties by altering the heat treatment temperatures and the extra quantity of cerium salts. The creation of many defects and heterostructures as a result of the nitrogen/oxygen doping and oxygen vacancy-rich CeO2 leads to better EMW attenuation, conductivity loss, and increased polarization effects. The remarkable microwave absorption ability of the C2-500 composite is attributed to good impedance matching and interfacial polarization as well as dipole polarization induced by a significant number of heterogeneous interfaces and oxygen vacancies, particularly from N/O heterogeneous elements. At a filler loading of 10 wt %, C2-500 exhibits a minimum reflection loss (RLmin) of −44.94 dB at 16.16 GHz, accompanied by an effective absorption bandwidth (EAB) of 4.72 GHz. In comparison, the C3-500 composites demonstrate an EAB of 4.88 GHz and an RLmin of −46.81 dB at 9.28 GHz. This study is expected to be instrumental in the design of high-performance biomass-derived porous carbon-based MAMs, providing valuable insights for future research in this field.
期刊介绍:
ACS Applied Nano Materials is an interdisciplinary journal publishing original research covering all aspects of engineering, chemistry, physics and biology relevant to applications of nanomaterials. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrate knowledge in the areas of materials, engineering, physics, bioscience, and chemistry into important applications of nanomaterials.